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FEATURES
Built-in shunts for digitally measuring dc currents
from 200uA to 20A
Functionally complete – no additional components
required
Wide power supply inputs:
5 to 40Vdc for 5V/12/24V/28V applications
36-75V option for telecom supplies
8-36Vdc Isolated-supply models for high-side shunts
20mV internal shunt minimizes power loss
Includes load connections for easy 3 or 4-wire
operation
High resolution; Factory calibrated to ±0.1% accuracy
Large, easy-to-read, LED display with 0.37” (9.4mm)
high digits
Available with red, blue or green LED displays
DCA-20PC Series
LED Display, Subminiature DC Ammeters
with Built-In Shunts
Murata Power Solutions’ new DCA-20PC Series are the ?rst digital dc ammeters to include built-in
shunts for measuring dc currents up to 20A. Six ranges provide for precision measurement of
dc currents from 200uA to 20A. These ammeters are 100% self-contained; no calibration or
user-supplied components are required—they even include terminal blocks for your external load
circuit, a feature that enables simple 3-wire operation!
Two shunt-con?gurations are offered: grounded-shunt (“low side”), 5-40V-powered models
for cost-sensitive applications, and 8-36V isolated-supply models for high side or ?oating shunt
applications. A versatile power supply design accommodates all popular supply voltages from 5 to
75Vdc. Reverse-polarity-protected supply inputs ensure trouble free installation. And, because many
dc ammeters are installed in battery backup applications, power consumption is typically below 1
Watt for 8-36V models, and below 75mW for 5-40V models. To further reduce overall power con-
sumption, the voltage dropped across its built-in series shunt is only 20mV!
DCA-20PC Series ammeters are housed in subminiature, 1.38? x 0.88? (35mm x 22mm),
rugged packages that feature a large, 0.37?/9.4mm high, LED display. A built-in, high-contrast
color ?lter ensures that legibility is not compromised: the display can be easily read at distances
up to 15 feet (5 meters). Available LED-display colors include brilliant blue, bright green, and
standard red.
Built-in shunts, Precision electronics, miniature size, wide power supply inputs, low power
consumption, and no-hassle 3-wire installation make DCA-20PC Series the ideal choice for all
your 200uA to 20A ammeter-applications.
Small 1.38? x 0.88? x 1.0? package
LED DISPLAY
–
+5V
INPUT
A/D
POWER
AMPLIFIER
–
+
BUILT-IN
SHUNT
+
CONVERTER
*
SIGNAL
GROUND
–5V
CONVERTER
POWER
GROUND
1
2
1
1
2
2 2
3
TB1
* Open on isolated-supply models
** Applies to isolated-supply models only
TB2
–SHUNT
(–V)
+SHUNT
–
EXTERNAL
+
LOAD (+)
+V
–V
**
LOAD
　
–
EXTERNAL
+
DC SUPPLY
For full details go to
www.murata-ps.com/rohs
Figure 1. Simpli?ed Schematic
www.murata-ps.com/support
MPM_DCA-20PC.B07 Page 1 of 6
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